Quarter Pounders are off the menu at 20% of McDonald's in US as E. coli cases are investigated

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  McDonald’s Takes Quarter Pounders Off Menus at 20 Percent of Restaurants After E. Coli Outbreak

  Business - Inc. - October 24
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  CDC investigates deadly E. coli outbreak tied to McDonald's Quarter Pounders

  Top stories - NBC News - October 23
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  E. coli cases rise to 104 in outbreak linked to McDonald's Quarter Pounders

  Top stories - NBC News - November 13
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  McDonald’s Quarter Pounder back on the menu after testing rules out beef patties as E. coli source

  Health - ABC News - October 27
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  Quarter Pounders Return to McDonald’s Menus After Beef is Ruled Out as E. Coli Source

  Business - Inc. - October 28
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  McDonald’s hit as Quarter Pounders tied to US E. coli outbreak

  Business - Financial Times - October 22
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  E. Coli Outbreak Linked to McDonald’s Quarter Pounders

  Business - The New York Times - October 23

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